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bpo-2986: Allow disabling difflib's automatic junk heuristic by liamFerris · Pull Request #17082 · python/cpython · GitHub

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bpo-2986: Allow disabling difflib's automatic junk heuristic #17082

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bpo-2986: Allow disabling difflib's automatic junk heuristic #17082

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9 changes: 5 additions & 4 deletions Lib/difflib.py
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Original file line number Diff line number Diff line change
Expand Up @@ -837,7 +837,7 @@ class Differ:
Compare two sequences of lines; generate the resulting delta.
"""

def __init__(self, linejunk=None, charjunk=None):
def __init__(self, linejunk=None, charjunk=None, autojunk=True):
"""
Construct a text differencer, with optional filters.

Expand All @@ -859,6 +859,7 @@ def __init__(self, linejunk=None, charjunk=None):

self.linejunk = linejunk
self.charjunk = charjunk
self.autojunk = autojunk

def compare(self, a, b):
r"""
Expand Down Expand Up @@ -886,7 +887,7 @@ def compare(self, a, b):
+ emu
"""

cruncher = SequenceMatcher(self.linejunk, a, b)
cruncher = SequenceMatcher(self.linejunk, a, b, self.autojunk)
for tag, alo, ahi, blo, bhi in cruncher.get_opcodes():
if tag == 'replace':
g = self._fancy_replace(a, alo, ahi, b, blo, bhi)
Expand Down Expand Up @@ -1330,7 +1331,7 @@ def decode(s):
for line in lines:
yield line.encode('ascii', 'surrogateescape')

def ndiff(a, b, linejunk=None, charjunk=IS_CHARACTER_JUNK):
def ndiff(a, b, linejunk=None, charjunk=IS_CHARACTER_JUNK, autojunk=True):
r"""
Compare `a` and `b` (lists of strings); return a `Differ`-style delta.

Expand Down Expand Up @@ -1365,7 +1366,7 @@ def ndiff(a, b, linejunk=None, charjunk=IS_CHARACTER_JUNK):
+ tree
+ emu
"""
return Differ(linejunk, charjunk).compare(a, b)
return Differ(linejunk, charjunk, autojunk).compare(a, b)

def _mdiff(fromlines, tolines, context=None, linejunk=None,
charjunk=IS_CHARACTER_JUNK):
Expand Down
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